With halloween just 24 hours away, a monster storm is rolling across the country. As families prepare to hit the streets with kids in tow, trick or treating has already been postponed in many communities. That could spread to many more in the path of this punishing storm. Abc's weather editor sam champion is tracking it all. Reporter: A line of severe storms roared through the middle of the country. Strong winds and flash flooding hitting areas like houston. Also in macon county, missouri golf ball sized hail pummelled drivers. The condition so bad trucks and cars were forced off the road. Halloween weather promises to be more frightening, hail, strong winds, heavy wind and lightning forecasted for 12 states. One to two inches of rain from michigan to kansas with nearly three to five inches of rain on the southern end of the storp. The weather forcing a change of halloween plans in america's heartland. I have six kids. I don't want to drag them out in the pouring rain. I was considering buying some candy. That way they'll have it even if we don't make it out. Reporter: In chicago those we speak to said the weather won't halt their halloween haunting. The weather is not going to stop us. We'll go out and have fun. Reporter: Big storms this time of year usually have a sno snowy component. This one does not. For halloween day and halloween night you're not affected by this storm. It's from the great lakes to america's heartland that are going to be affected but will be a very strong line of storms during that 24-hour period. Right across the middle of the country, sam, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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